d
With rotation of earth or latitude, acceleration due to gravity vary as \(g' = g - {\omega ^2}R\,\,{\cos ^2}\,\phi \) Where \(\phi \) is latitude, there will be no change in gravity at poles as \(\phi = 90^o\) At all other points as \(\omega \) increases \(g'\) will decreases hence, weight, \(W = mg\) decreases.